Dust arrester



TEQ 3 s. s. PARSONS 3 nus-r ARRBSTER Filed April 5. 1927 :s Sheets-Sheet 1 lNvEN'rok SEELY 5. PARSONS BY M A ATTORNEYS Feb. 1'1, 1930. s. s. PARSONS DUST ARRESTER Filed April 5, 1927 :5 Shets-Sheet 2 INVENTOR 55cm 5. PARSONS ATTORNEYS.

Feb. 11, 1930. g s. PARSONS nusr A RnBsTBR' 5 Sheets-Sheet 3 Filed April 5, 1927 4% K. we a M .ms M W m x R 3 m 4 7 Q a. 5.. J

v I I l an Patented Feb. 11, 1930;

UNITED STATES PATENT OFFICE sEnLY SHERWOOD PARSONS, OF CLEVELAND, OHIO, .ASSIGNOR TO THE NEW HAVEN SAND BLAST COMPANY, OF NEW HAVEN, CONNECTICUT, A CORPORATION 01 CON- NECTICUT Application filed April 5,

My invention relates to dust arresters, and particularly to arresters of the bag type. In arresters of this general type (see for example Fatscher Patent No. 1,496,666) the dust laden air is drawn by suction through -a group of filter bags, the solids carried by the air being deposited on the interior of the filter bags. At appropriate intervals the draft is halted and the bags are shaken to dislodge the dust from the inner faces of the bag walls, so that it falls into suitable collecting receptacles or hoppers arranged beneath the bags.

My invention is concerned primarily with the mounting of the filter bags and their shakin mechanism and rovides certain im rovements in these features which will be hereinafter described, or illustrated in the accompanying drawings in which-- Fig. ,1 is a perspective'view of a dust arrester;-

Fig. 2 is a broken plan view thereof, on a largerscale;

Fimqdis a broken section on 3-3, Fig. 2;

Fig. i is a broken section on M, Fig. 3, to a larger scale;

Fig; 5 is a partial end view, broken, of the may be embodied inother types of arrester construction, I have illustrated an installation of the general type shown in the Fatscher patent above mentioned. An arrester of this type comprises a closed sheet metal housing 15, to the upper portion of which opens the suction pipe 16. The bottom of the housing is open in its central area, and this opening is spanned by upwardly-faced channel bars 17 arranged in parallel and suitably spaced apart to form in effect a grid. These bars are supported at their ends by structural angles 18 which also support the bottom DUST ARRESTER 1927.- Serial No. 181,081.

19 of the housing and bound the central open area thereof. Below the channel bar grid and carried by the' angle irons 18 is a dust chamber 20, to which the dust laden air is led out the entrained solids from the air as it passes through the bag walls into the interior of the housing 15 and thence to the suction pipe 16.

It Will be noted that in the patent to F atscher above mentioned, the lower open ends of the bags are passed downward through the grid openings in a wooden floor for the housing, and are secured beneath; the floor by meansof clamping plates screwed to the lower'surface of the floor. this the workmen must enter the dust chamber and work in very inconvenient and dirty quarters when it becomes necessary to repair or replace a filter bag. My present construe In order to effect? tion obviates this disadvantage by providing, 1

for the attachment of the lower, open bag ends, means which are accessible to the work- 'men from the floor 19 of the clean air chamber afforded by the housing 15. v

For this purpose I have shown in Figs. 4

to 7 the lower or open end of each bag provided at its opposite sides, with beads, formed by metal rods 25 passed through bottomhems 26. When the bag is arranged in position, these rods lie within the adjacent channels 17 and next to the opposed side flanges 27 (Fig. 6) of these channels. Each channel 17 of the grid therefore accommodates the beads at the bottoms of the adjacent sides of adjacent bags. Overlying these beads and wedging them firmly into thecorners of the channel is a clamping bar 28 adapted to enter between the channel flanges 27 and to be pressed down in clamping engagement with the beads. Any suitable means accessible from the upper face of the g'id formed b the spaced channel bars may used to hol the clamping bars 28 in position. I prefer means which engage each bar individuallyso that it is possible to release a single bagwithout otherwise disturbing the assembly. For this purpose I have shown screw bolts 29 suitably spaced along and secured to the bottom of each channel 17 and pro ecting upward through corresponding oles in the clamp bar 28 for the reception of win nuts 30 which bear u on the upper face of t e clamp bar 28 and fbrce it downward firmly into clamping engagement with the side beads of the bag mouths located in the channel. It will be obvious that by removmg the wing nuts 30 from the screw bolts 29 of adjacent channel bars 17, thus freeing their clamp bars 28, the beads at opposite sides of the lower open end of any single bag are released and this bag may be removed zvithout otherwise disturbing the installaion.

In order that theremay be no air leakage at the opposite ends of the bag mouth, I secure to each wooden spacer block 31 between the ends of adjacent channels 17, an angle 32. The upri ht flange of the latter is of substantially t e width of the bag end and is located substantially flush with the end of the bag. Consequently when the bag is adjusted in position, with its side beads in adjacent channels, the'bag ends embrace the angles 32. If the ends of the bag mouth are slit to form end flaps 33 as shown, the latter may be turned outward to overlie the spacer blocks 31 beyond the angles 32, where they are engaged by wooden sealing blocks: 34. The end screw pins 29 are of sufficient length to proect through the sealing blocks 34 which rest on the tops of the channels and spacer blocks, and are of such length that they extend substantially halfway over the spacers on opposite sides of the channel to which'the sealmg blocks are secured by wing nuts 35. Each bag end flap 33 is consequently clamped down on the top of its sub'acent spacer block by the adjacent ends of t e sealing blocks at the ends of the adjacent channels in which-the side beads of the bag mouth are received.

It will be noted that all the wing nuts by which the bag mouth ends and sides are clamped in position, are accessible from the clean air chamber of the casing 15, andthat the workman is under no necessity of entering the dust chamber 20 for this purpose.

At its upper or closed end each bag is provided with a hem 36 (Figs. 4 and 8) to receive a suspension rod 37 which extends therethrough the width of the bag. At spaced intervals the rod 37 is flatted at.38 to I receive a hook 39 passed through the fabric of the hem and engaged in the notch 38 of the rod. I have shown two points of suspension for each bag. The head of each hook 39 is welded in the lower end of a turnbuckle 40, the upper end of which is provided with an adjusting screw eye 41 into which is freely hooked the lower end of a coil spring 42 engaged at its opposite end in a hole in the angle bar 43. constituting a portion of the top frame of the housing 15. Uniform tension on all bags, regardless of variations in their length orv stretch of material, may be obtained by appropriate adjustment of the screw eyes 41 of their spring suspensions. This operation may be readily performed by unhooking the supporting spring from its screw eye 41 and then rotating the screw eye with respect to the turnbuckle to shorten or lengthen the effective-distance between the bag and the supporting angle 43.

The shaking mechanism b which the bags are freed at suitable interva s from the dust accumulations on the interior thereof, comprises bars 44 passed through the alined turnbuckles of the several bag suspensions. The

I bars 44 pass freely through the openings of the turnbuckles but are engaged with the latter' by cotter pins 45, or the like, passed through each shaker bar 44 on'oppos'ite sides of each turnbuckle. The shaker bars thus do not interfere with the vertical adjustment of the turnbuckles by which uniform bag tension is attained, while at the same time an operating engagement is established between the bars and turnbuckles by which vibratory motion may be imparted to the bags. The bars 44 are connected, for operation in unison, by a cross rod 46 freely pivoted in upstanding lugs 47 on the respective shaker bars. The

cross rod 46 in turnis engaged by a connecting rod 48 extending to crank 49 of driving mechanism of any suitable character. I have indicated an electric motor 50 supported at 51 on the exterior of the housing 15 and driving the crank shaft through a clutch and train of'reducing gears 52. When the crank shaft is in operation its motion is imparted through the connecting rod 48 and cross rod 46 to the shaker bars 44. The reciprocation of the shaker bars vibrates the bags, with the result that the dust adhering to the inner walls of the bags is freed and falls through the interspaces between the channels 17 into the dust chamber 20, thence to the hopper 23, from which it may be removed at once or permitted to accumulate, as may be desired.

In Figs. 9, 10 and 11 I have indicated a modified attachment of the bag mouths to the .channel bar grid without the use of wood members. The flanges of the channel bars 53 are cut away at their-ends, thus leaving the channel bottoms 54 of the channel bars projecting for attachment to the angle irons 18 1n any suitable fashion, as by rivets or bolts 55. The bars are spaced apart by metal plates 56, corresponding substantially in thickness to the channel bottoms, the spacing plates being also secured to the angle irons 18 by bolts 57. While both channel bars and spacer plates may be directly welded to the frame angles, I prefer to interpose between these elements a sealing strip 58 of felt, or the like, through which the bolts or rivets pass.

Each of the bead-forming rods 59 which enters the hem 26 at the mouth of the bag, is provided with an offset end 60, so that each rod forms a bead not only at the side of the bag month which enters one channel bar, but also across the end of the bag which spans the space between that bar and the adjacent bar, the extremity of the offset end 60 extending sutliciently into the adjacent channel .to be engaged by the metal clamping bar 61 which overlies the side beads therein. used in any one bag are inserted in opposite directions so that the offset ends 60 are at 0pposite ends of the bag, one lying in one direction, the other in the reverse direction. Fig.

9 shows one end, of which the other end is a duplicate except for the reverse direction of the end 60. Screw pins 62 riveted to the bottom of the channel and appropriately spaced along its length, pass upward through similarly spaced holes in the clamping bar to receive the wing nuts 63 by which the bar is held in clamping position. Inasmuch as the clamping bar extends beyond the ends of the side flanges of the channel, it engages the extremities of the offset ends of the bead-forming rods and firmly clamps the latter in position, thus sealing the sides of the bag in the channels 53, and the bag ends against the upper faces of the spacer plates 56. This construction eliminates the necessity of forming the bag end flaps 33, and the hem 26 is carried around the entirebag mouth, with. a single opening at the side of each end for the introduction of the bead-forming rod.

Obviously the wing nuts 63 are accessible from the clean air chamber of the casing for the ready removal of the clamp bars 61, while the clamping means are simplified, and metal parts, which are not subject to breakage or shrinkage, are used throughout.

In both of the constructions described, I have indicated metal rods detachably insertable in hems at the bag mouths, to form the beads, since a rigid element of this type simplifies the location of the sides of the bag mouth in the channel bars. It is obvious, however, that if for any reason preferred, the bead may be formed in any other manner, for example by sewing a rope to or into the margins of the bag mouth.

Similarly the channel 27 may be substituted for by angle irons suitably spaced0r by other appropriate means for the reception of the bag mouth beads and associated clamping devices, so long as the latter are accessible from the clean air chamber of the casing.

Again the bag suspension may be varied in detail while still embodying the thoughts The two bars tially rectangular, open-mouthed filter bags,

meansfor supporting the same, mouth downward, in substantially parallel relation, an upwardly-faced channel Within which one side of each of said bag mouths is received, a bead at each bag mouth side, and removable clamping means fitting between the sides of the channel and engaging the beads of the bag mouth sides to clamp the latter in the channel.

3. In a dust arrester, a pair of spaced, parallel, upwardly faced channels, a rectangular open mouthed bag, means for suspending the bag, mouth downward, with the opposlte sides of the bag mouth spanning-the adjacent sides of said spaced channels, and means removable from said channels for clamping the sides of the bag mouth therein.

4. In a dust arrester, a battery of filter bags, vertically adjustable suspension means for each of said bags by which the several bags freely and laterally engaging the-suspension means for each bag whereby to vibrate the bags and allow vertical adjustment of the suspension means.

5. In a dust arrester, a battery of filter bags, adjustable means associated with each of said bags for suspending the latter at uniform tension regardless of differences in bag length,

said means including a vertically elongated loop member, in combination with a shaker bar passing with vertical clearance through the loop members of the several bag suspensions and engaging said loop members for lateral displacement thereof, unafiected by variations of vertical adjustments.

6. In a dust arrester, a battery of filter bags, a suspension for each bag including a turnbuckle for vertically adjusting its suspension, in combination with a shaker bar passing with vertical clearance through the several turnbuckles of the bag battery, but laterally engaging the same to shake the bags on the reciprocation of said bar.

7 In a dust arrester, a battery of filter bags, a plurality of suspension devices for each bag, eachdevice including a vertically elongated loop member, shaker bars passing with vertical clearance through the loop members of each bag of the battery and inilateral engagement therewith, a tie bar between the shaker bars and an actuating member for reciprocating the tie bar.

8. In a dust arrester, a filter bag of gener ally rectangular shape and having its open end faced downward, its upper or closed end being transversely seamed to afford a hem,

together with a suspension rod arran ed in said hem, said rod having contracte ortions, and means associated with said r0 for flexibily suspending the bag, said suspension means being associated with a contracted portion of the rod and thereby being adapted to prevent longitudinal displacement of the rod in said hem.

In testimony whereof I have signed my name to this specification.

SEELY SHERWOOD PARSONS. 

